CN104471789A - Antenna device and electronic equipment - Google Patents

Antenna device and electronic equipment Download PDF

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Publication number
CN104471789A
CN104471789A CN201380037197.XA CN201380037197A CN104471789A CN 104471789 A CN104471789 A CN 104471789A CN 201380037197 A CN201380037197 A CN 201380037197A CN 104471789 A CN104471789 A CN 104471789A
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CN
China
Prior art keywords
frequency band
antenna
antenna assembly
radiant element
power supply
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201380037197.XA
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Chinese (zh)
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CN104471789B (en
Inventor
用水邦明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Murata Manufacturing Co Ltd
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Murata Manufacturing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Murata Manufacturing Co Ltd filed Critical Murata Manufacturing Co Ltd
Priority to CN201610912777.4A priority Critical patent/CN106299597B/en
Priority to CN201510069663.3A priority patent/CN104638349B/en
Priority to CN201610913172.7A priority patent/CN106340706B/en
Publication of CN104471789A publication Critical patent/CN104471789A/en
Application granted granted Critical
Publication of CN104471789B publication Critical patent/CN104471789B/en
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Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
    • H01Q1/2216—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in interrogator/reader equipment
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/28—Combinations of substantially independent non-interacting antenna units or systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
    • H01Q5/328—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors between a radiating element and ground
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
    • H01Q5/335—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors at the feed, e.g. for impedance matching
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
    • H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
    • H01Q5/364—Creating multiple current paths
    • H01Q5/371—Branching current paths
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Abstract

A U-shaped radiating element (21) is formed in a non-grounded zone (NGZ) of a substrate. A first reactor element (reactor(L1)) which is equivalent to a short-circuit state under a second frequency band (HF frequency band) is connected between the second end of the radiating element and a grounded conductor (11). A second reactor element (reactor(C1)) which is equivalent to the short-circuit state is connected between the first end of the radiating element (21) and the grounded conductor (11). In a UHF frequency band, the radiating element (21) and the grounded conductor (11) perform a function of a reversed-F-shaped antenna which improves electric field radiation. In the HF frequency band, a loop which is formed by the radiating element (21) and the grounded conductor (11) performs a function of an annular antenna which improves magnetic field radiation.

Description

Antenna assembly and electronic equipment
Technical field
The present invention relates to the antenna assembly of dual-purpose in the communication system of the different signal of communication of service band and possess the electronic equipment of this antenna assembly.
Background technology
Along with high performance in recent years, the antenna of not only built-in call, also starts the antenna of various communication (broadcast) systems such as built-in GPS, WLAN, received terrestrial digital broadcasting.
Such as patent documentation 1 discloses the antenna assembly of dual-purpose in a kind of communication system of the signal of communication different at service band.
Prior art document
Patent documentation
Patent documentation 1: Japanese Patent Laid-Open 2007-194995 publication
Summary of the invention
Invent technical problem to be solved
On the other hand, in order to tackle the deterioration of the mechanical strength brought with miniaturized, slimming of the small communication terminal devices such as mobile telephone terminal, start " metallization " that advance housing, such as coating metal etc. on the whole surface of the housing be in the past made of resin.But therefore if by the inner side of built-in antenna in metallized housing, then by metallic shield, can there is the problem that cannot communicate in the signal exported from antenna.Therefore, employing makes a part for housing non-metallic and the structure fixed up an aerial wire in its vicinity usually.
But in recent years, also start the rfid system of the HF frequency bands such as built-in NFC (Near Field Communication: near-field communication) more and more.If the aerial coil used in this HF frequency band rfid system is also configured in above-mentioned non-metal portion, be then difficult to the space of guaranteeing needed for antenna.
That is, how existence forms and how to assemble the problem of the antenna applying multiple frequency band.
Above-mentioned situation is not limited to the antenna of communication use, broadcast reception, in the electronic equipment possessing power delivery antenna (power receiving and transmitting part), can run into this problem too.
The object of the present invention is to provide a kind of can in multiple systems that frequency band is different dual-purpose compact-size antenna device and possess the electronic equipment of this antenna assembly.
The technical scheme that technical solution problem adopts
The structure of antenna assembly of the present invention is as follows.
(1) radiant element comprising electric field type antenna and the earthing conductor be oppositely disposed with described radiant element, is characterized in that,
Be connected with at least one first reactor element between described radiant element and described earthing conductor, be made up of the ring portion of field type antenna described radiant element, described first reactor element and described earthing conductor.
According to said structure, radiant element plays the effect of electric field radiation element originally under the first frequency band (such as UHF band), under the second frequency band (such as HF frequency band), all or part of of described radiant element is also used as a part for ring portion, thus plays the effect of magnetic field radiation element.Therefore, can in the system being suitable for the first frequency band with the system using the second frequency band dual-purpose, the miniaturization of antenna assembly can be realized.
(2) be preferably, described radiant element is the antenna element of the first frequency band, and described ring portion is the antenna element of second frequency band lower than described first frequency band.
(3) be preferably, described first reactor element be impedance under the second frequency band than the first frequency band closer to short-circuit condition, under the first frequency band than the second frequency band closer to the element of open-circuit condition, and be arranged under the state close to described short-circuit condition, form the position of described ring portion together with described radiant element and described earthing conductor.Thus, the first reactor element can not impact the antenna action under the first frequency band, and described ring portion can be made to play the effect of the antenna under the second frequency band.
(4) be preferably, described first reactor element be under described first frequency band for capacitive, under described second frequency band for perception inductor.Utilize this structure, thus the first reactor element can be used as the electric capacity of resonant circuit under the service band of the first frequency band (UHF band), under the second frequency band (HF frequency band), be used as the inductance of resonant circuit.
(5) be preferably, comprise the second reactor element be connected in series with described first reactor element, described radiant element and described earthing conductor,
Described second reactor element be impedance under the second frequency band than the first frequency band closer to open-circuit condition, under the first frequency band than the second frequency band closer to the element (capacitor) of short-circuit condition.
Utilize said structure, under the frequency of utilization of the first frequency band (such as UHF band), the second reactor element can be used as earth terminal, described radiant element be used as the radiant element of one end ground connection under the first frequency band.
(6) be preferably, in above-mentioned (5), described second reactor element be under described first frequency band for perception, be the capacitor of capacitive under described second frequency band.Utilize this structure, this capacitor can be used as the electric capacity of the resonant circuit under the second frequency band (such as HF), and the resonance frequency of this resonant circuit can be determined.In addition, can by (two ends of the second reactor element) between described capacitor and described radiant element as the power supply of the second band communication signal.
(7) be preferably, be configured with the power supply circuits of the signal of communication that described second frequency band is provided at the two ends of described first reactor element (reactance), described second reactor element (electric capacity) and described second reactor element in the mode of a high-frequency model.Utilize this structure, decrease the component number that will install, and the structure of radiant element can be simplified.
(8) be preferably, comprise the 3rd reactor element, 3rd reactor element with described radiant element is provided the supply terminals of the signal of communication of described first frequency band be connected (be connected to and described first frequency band signal of communication power supply circuits between), and higher with described first frequency band phase specific impedance under described second frequency band.Utilize this structure, be connected with the 3rd reactor element between the supply terminals of the power supply circuits of the signal of communication of the first frequency band and the signal of communication of the first frequency band, the 3rd reactor element is used as the element to the decoupling zero of the signal of the second frequency band.Therefore, harmful effect can not be caused when the second band communication to the power supply circuits of the first frequency band.
(9) be preferably, comprise power supply coil, this power supply coil is connected with the power supply circuits of the signal of communication of described second frequency band, and with described ring portion magnetic Field Coupling.Utilize this structure, thus the circuit without the need to powering directly to radiant element, the structure of electric power-feeding structure and power supply circuits can be simplified.In addition, when supply lines encloses RFID antenna effect, described ring portion can be used as the resonance gain device of RFID antenna.
(10) such as described radiant element is the antenna of cellular communication, and described ring portion is the antenna of HF frequency band rfid system.
(11) be preferably described first reactor element be connected in series by multiple reactor element and form.Utilize this structure, even if when self-resonance, be also open-circuit condition because of parasitic component under each resonance frequency respectively at multiple reactor element.Therefore, radiant element plays the effect of antenna under these resonance frequencys, therefore can realize broadband.
(12) electronic equipment of the present invention comprises the antenna assembly shown in above-mentioned (1), provides the second power supply circuits of the first power supply circuits of the signal of communication of the first frequency band, the signal of communication providing the second frequency band or power to this antenna assembly.
Invention effect
According to the present invention, radiant element is used as electric field radiation element in the first frequency band, in the second frequency band be used as magnetic field radiation element, therefore can the communication system of use first frequency band and use the second frequency band communication system in dual-purpose, the miniaturization of antenna assembly can be realized.
Accompanying drawing explanation
Fig. 1 is the vertical view of the major part of the antenna assembly 101 of execution mode 1.
Fig. 2 is the equivalent circuit diagram of the antenna assembly 101 under two frequency bands.
Fig. 3 is the equivalent circuit diagram of the lumped-parameter element of the antenna assembly 101 of execution mode 1.
Fig. 4 is equivalent circuit diagram when being provided with low pass filter LPF in the input and output portion of the second power supply circuits 32.
Fig. 5 is the vertical view of the major part of the antenna assembly 102 of execution mode 2.
Fig. 6 is the equivalent circuit diagram under the HF frequency band of the antenna assembly of execution mode 2.
Fig. 7 is the vertical view of the major part of the antenna assembly 103 of execution mode 3.
Fig. 8 is under two frequency bands, the equivalent circuit diagram of the antenna assembly of execution mode 3.
Fig. 9 is the figure of antenna assembly, the particularly structure of its radiant element 21 representing execution mode 4.
Figure 10 is the vertical view of the major part of the antenna assembly 105 of execution mode 5.
Figure 11 is the vertical view of the major part of the antenna assembly 106 of execution mode 6.
Figure 12 is the figure of the mode of the magnetic Field Coupling representing power supply coil 33 and radiant element 21.
Figure 13 is the equivalent circuit diagram under the HF frequency band of the antenna assembly of execution mode 6.
Figure 14 is the vertical view of the major part of the antenna assembly 107 of execution mode 7.
Figure 15 is under two frequency bands, the equivalent circuit diagram of the antenna assembly of execution mode 7.
Figure 16 be the communication terminal 201 of the antenna assembly possessing execution mode 8, vertical view under the state unloading lower case.
Figure 17 be the communication terminal 202 of the antenna assembly possessing execution mode 9, vertical view under the state unloading lower case.
Figure 18 be the communication terminal 203 of execution mode 10, vertical view under the state unloading lower case.
Figure 19 is the vertical view of the major part of the antenna assembly 111 of execution mode 11.
Figure 20 is the figure of the frequency characteristic of the insertion loss (S21) representing the first reactor element observed from power supply circuits.
Embodiment
" execution mode 1 "
Fig. 1 is the vertical view of the major part of the antenna assembly 101 of execution mode 1.This antenna assembly 101 is formed on the substrate 10.Substrate 10 comprise the forming region of earthing conductor 11 and do not form the ungrounded region NGZ of earthing conductor.The radiant element 21 of U-shaped is formed in ungrounded region NGZ.That is, the part that this radiant element 21 is parallel by the end limit with earthing conductor 11 and forming from the part that this parallel portion extends to earthing conductor direction.Install between the first end of radiant element 21 and earthing conductor 11 and be electrically connected with chip capacitor (capacitor) C1.Install between second end of radiant element 21 and earthing conductor 11 and be electrically connected with SMT Inductor L1.Inductor L1 is equivalent to the first reactor element of the present invention, capacitor C1 is equivalent to the second reactor element of the present invention.
Substrate 10 is respectively equipped with the first power supply circuits 31 be made up of UHF band (the first frequency band) IC and the second power supply circuits 32 be made up of HF frequency band (the second frequency band) RFID IC.
The input and output portion of the first power supply circuits 31 is connected with the supply terminals of the regulation of radiant element 21 via capacitor C3.The input and output portion of the second power supply circuits 32 is connected to via capacitor C2 near the first end of radiant element 21.
Fig. 2 is the equivalent circuit diagram of the antenna assembly 101 under two frequency bands.In Fig. 2, equivalent electric circuit EC11, EC12 are the equivalent circuit diagrams under UHF band, and equivalent electric circuit EC20 is the equivalent circuit diagram under HF frequency band.
Capacitor C1 shown in Fig. 1 is equivalent to short-circuit condition for Low ESR under UHF band, and therefore as shown in earth terminal SP in the equivalent electric circuit EC11 of Fig. 2, the first end grounding connection of radiant element 21 is to earthing conductor 11.In addition, the inductor L1 shown in Fig. 1 is high impedance and be equivalent to open-circuit condition under UHF band, therefore as shown in open end OP in the equivalent electric circuit EC11 of Fig. 2, and the second end open circuit of radiant element 21.Capacitor C1 is reigning under UHF band is the emotional resistance of element, therefore can be expressed as the inductor Le ground connection via equivalence as shown in the equivalent electric circuit EC12 of Fig. 2.In addition, inductor L1 is reigning under UHF band is the capacitive reactances of element, therefore can be expressed as the capacitor Ce being connected with equivalence between the open end and ground connection of radiant element 21 as shown in the equivalent electric circuit EC12 of Fig. 2.
The supply terminals that first power supply circuits 31 specify to radiant element 21 provides voltage.Under UHF band, the mode resonance that current strength that is maximum with the electric field strength of the open end of radiant element 21, earth terminal SP is maximum.In other words, determine the value etc. of the length of radiant element 21, equivalent inductor Le and capacitor Ce, thus under UHF band resonance.Wherein, this radiant element 21 in the low-frequency band of the frequency band of 700MHz ~ 2.4GHz with fundamental mode resonance, with higher modes resonance in high frequency band.Thus, in UHF band, radiant element 21 and earthing conductor 11 play the effect of the inverted F shaped antenna contributing to electric field radiation.In addition, here for the example of inverted F shaped antenna, but unipole antenna etc. can be applied to too.In addition, the paster antennas such as tabular inverse-F antenna (PIFA) can be applied to too.
On the other hand, in HF frequency band, as shown in the equivalent electric circuit EC20 of Fig. 2, form LC resonant circuit by the electric capacity of radiant element 21, the end limit of the earthing conductor 11 relative with this radiant element 21, the inductance of inductor L1 and capacitor C1.Second power supply circuits 32 provide the signal of communication of second frequency to the two ends of capacitor C1 via capacitor C2.
Above-mentioned LC resonant circuit resonance under HF frequency band, resonance current flows into the end limit of radiant element 21 and earthing conductor 11.In other words, determine the value etc. of the length of radiant element 21, inductor L1 and capacitor C1, thus under HF frequency band resonance.Thus, in HF frequency band, the ring portion be made up of radiant element 21 and earthing conductor 11 plays the effect of the loop aerial contributing to magnetic field radiation.
Capacitor C3 shown in Fig. 1 is high impedance under HF frequency band (the second frequency band), and become the state of non-Equivalent conjunction first power supply circuits 31, therefore the first power supply circuits 31 can not impact the communication of HF frequency band.And under UHF band (the first frequency band), the first end equivalence ground connection of radiant element 21, or via low inductance ground connection, therefore do not have the signal of communication of UHF band to flow through in the second power supply circuits 32, the second power supply circuits 32 can not impact the communication of UHF band.
Thus, antenna assembly 101 plays the effect of the communication antenna using UHF band (the first frequency band) and the communication antenna using HF frequency band (the second frequency band).
Fig. 3 is the equivalent circuit diagram of the lumped-parameter element of the antenna assembly 101 of execution mode 1.In Fig. 3, equivalent electric circuit EC1 is the equivalent circuit diagram under UHF band, and equivalent electric circuit EC2 is the equivalent circuit diagram under HF frequency band.In Fig. 3, represent radiant element 21 with inductor L21A, L21B, represent earthing conductor 11 with inductor L11.
As shown in Figure 3, under UHF band, in equivalent electric circuit EC1, flow through the electric current shown in arrow, play the effect of inverted F shaped antenna.Under HF frequency band, in equivalent electric circuit EC2, flow through the electric current shown in arrow, play the effect of loop aerial.
Fig. 4 is equivalent circuit diagram when being provided with low pass filter LPF in the input and output portion of the second power supply circuits 32.In the example of fig. 4, between the power supply circuits 32 be made up of RFID IC and capacitor C2, be provided with the low pass filter LPF be made up of inductor L4 and capacitor C4.Structure shown in the equivalent electric circuit EC1 of other structure and Fig. 3 is identical.Low pass filter LPF removes from the RFID high frequency noise component that IC exports.Thereby inhibiting noise component to the impact using the communication of UHF band and use the communication of HF frequency band to cause.
" execution mode 2 "
Execution mode 2 shows the second power supply circuits carry out example from balanced feeding to antenna.
Fig. 5 is the vertical view of the major part of the antenna assembly 102 of execution mode 2.This antenna assembly 102 is formed on the substrate 10.Substrate 10 comprise the forming region of earthing conductor 11 and do not form the ungrounded region NGZ of earthing conductor.The radiant element 21 of U-shaped is formed in ungrounded region NGZ.The circuit comprising multiple SMD components and the second power supply circuits 32 is configured with between the first end of radiant element 21 and earthing conductor 11.SMT Inductor L1 is connected with between second end of radiant element 21 and earthing conductor 11.Structure shown in other structure with Fig. 1 is identical.
Fig. 6 is the equivalent circuit diagram under the HF frequency band of the antenna assembly 102 of execution mode 2.In Fig. 6, represent radiant element 21 with inductor L21, represent earthing conductor 11 with inductor L11.LC resonant circuit is constituted by these inductors L21, L11, L1 and capacitor C1A, C1B.
Second power supply circuits 32 and be configured with the low pass filter be made up of inductor L4A, L4B and capacitor C4A, C4B between capacitor C2A, C2B.Second power supply circuits 32 provide the signal of communication of second frequency evenly to the two ends of capacitor C1A, C1B via above-mentioned low pass filter and capacitor C2A, C2B.Also balanced feeding circuit can be applied thus.
" execution mode 3 "
Fig. 7 is the vertical view of the major part of the antenna assembly 103 of execution mode 3.This antenna assembly 103 is formed on the substrate 10.Substrate 10 comprise the forming region of earthing conductor 11 and do not form the ungrounded region NGZ of earthing conductor.The radiant element 21 of U-shaped is formed in ungrounded region NGZ.The direct grounding connection of first end of radiant element 21 is to earthing conductor 11.SMT Inductor L1 and chip capacitor C1 is connected in series with between second end of radiant element 21 and earthing conductor 11.
Substrate 10 is respectively equipped with the first power supply circuits 31 be made up of UHF band IC and the second power supply circuits 32 be made up of HF frequency band RFID IC.
The input and output portion of the first power supply circuits 31 is connected with the supply terminals of the regulation of radiant element 21 via capacitor C3.The input and output portion of the second power supply circuits 32 is connected to the connecting portion of inductor L1 and capacitor C1 via capacitor C2.
Above-mentioned inductor L1, capacitor C1, C2 and the second power supply circuits 32 are configured to a RF module 41, and this RF module 41 is installed on the substrate 10.
Fig. 8 is the equivalent circuit diagram of the antenna assembly 103 under two frequency bands.In Fig. 8, equivalent electric circuit EC11, EC12 are the equivalent circuit diagrams under UHF band, and equivalent electric circuit EC20 is the equivalent circuit diagram under HF frequency band.
Capacitor C1 shown in Fig. 7 is equivalent to short-circuit condition for Low ESR under UHF band, but the inductor L1 shown in Fig. 7 is equivalent to open-circuit condition for high impedance under UHF band.Therefore, as shown in open end OP in the equivalent electric circuit EC11 of Fig. 8, the second end open circuit of radiant element 21.If represent the capacitive component of capacitor C1 under UHF band and inductor L1 with equivalent condenser Ce, then as shown in the equivalent electric circuit EC12 of Fig. 8, the capacitor Ce of equivalence can be connected with between the open end and ground connection of radiant element 21.
The supply terminals that first power supply circuits 31 specify on radiant element 21 provides voltage.Under UHF band, the mode resonance that current strength that is maximum with the electric field strength of the open end of radiant element 21, earth terminal SP is maximum.In other words, determine the value etc. of the length of radiant element 21, equivalent condenser Ce, thus under UHF band resonance.Thus, in UHF band, radiant element 21 and earthing conductor 11 play the effect of the inverted F shaped antenna contributing to electric field radiation.
On the other hand, in HF frequency band, as shown in the equivalent electric circuit EC20 of Fig. 8, form LC resonant circuit by the electric capacity of radiant element 21, the end limit of the earthing conductor 11 relative with this radiant element 21, the inductance of inductor L1 and capacitor C1.Second power supply circuits 32 provide the signal of communication of second frequency to the two ends of capacitor C1 via capacitor C2.
Above-mentioned LC resonant circuit resonance under HF frequency band, resonance current flows into the end limit of radiant element 21 and earthing conductor 11.In other words, determine the value etc. of the length of radiant element 21, inductor L1 and capacitor C1, thus under HF frequency band resonance.Thus, in HF frequency band, the ring portion be made up of radiant element 21 and earthing conductor 11 plays the effect of the loop aerial contributing to magnetic field radiation.
Capacitor C3 shown in Fig. 7 is high impedance under HF frequency band (the second frequency band), and become the state of non-Equivalent conjunction first power supply circuits 31, therefore the first power supply circuits 31 can not impact the communication of HF frequency band.And under UHF band (the first frequency band), the first end equivalence ground connection of radiant element 21, or via low inductance ground connection, therefore do not have the signal of communication of UHF band to flow through in the second power supply circuits 32, the second power supply circuits 32 can not impact the communication of UHF band.
Thus, antenna assembly 103 plays the effect of the communication antenna using UHF band (the first frequency band) and the communication antenna using HF frequency band (the second frequency band).
" execution mode 4 "
Fig. 9 is the figure of antenna assembly, the particularly structure of its radiant element 21 representing execution mode 4.
The example that substrate is provided with the radiant element be made up of conductive pattern has been shown in execution mode 1 ~ 3, but also can as shown in Figure 9, radiant element 21 is made up of metallic plate.In addition, the anchor ring of the ring portion also can not formed by radiant element 21 and earthing conductor in the face of earthing conductor 11, also can be not parallel.Can as shown in Figure 9, anchor ring is vertical with the surface of earthing conductor 11.
About earthing conductor 11, be also formed on substrate without using conductive pattern, can be made up of such as metallic plate.Metallized package body can also be used as a part for earthing conductor.
In the example of Fig. 9, radiant element 21 first end 21E1, be respectively equipped with gap between the second end 21E2 and earthing conductor 11.Also can at this part setting example chip capacitor C1, SMT Inductor L1 as shown in Figure 1.
In addition, in the example of figure 9, with the electrode 12 of earthing conductor 11 electrical separation on projectingly have the power supply pin FP be made up of spring catch etc., this power supply pin FP abuts with the assigned position of radiant element 21 and powers to it.
" execution mode 5 "
Figure 10 is the vertical view of the major part of the antenna assembly 105 of execution mode 5.The radiant element 21 of C font is formed in the ungrounded region NGZ of substrate 10.SMT Inductor L1 and chip capacitor C1 is connected in series with between one end FP2 of part relative with the end limit of earthing conductor 11 in this radiant element 21 and earthing conductor 11.
Substrate 10 is respectively equipped with the first power supply circuits 31 be made up of UHF band IC and the second power supply circuits 32 be made up of HF frequency band RFID IC.
The input and output portion of the first power supply circuits 31 is connected with the supply terminals FP1 of the regulation of radiant element 21 via capacitor C3.The input and output portion of the second power supply circuits 32 is connected to the connecting portion of inductor L1 and capacitor C1 via capacitor C2.
Above-mentioned inductor L1, capacitor C1, C2 and the second power supply circuits 32 are configured to a RF module 41, and this RF module 41 is installed on the substrate 10.
From the line length of the above-mentioned supply terminals FP1 to first end 21E1 of radiant element 21, different to the line length of the second end 21E2 from from supply terminals FP1.Resonance under two frequency bands of the low-frequency band of this radiant element 21 in the frequency band of 700MHz ~ 2.4GHz and high frequency band.According to the electric capacity produced between the first end 21E1 of radiant element 21 and the second end 21E2, above-mentioned two resonance frequencys are adjusted.
Part between supply terminals FP1 and the tie point FP2 of module 41 in radiant element 21, UHF band forms a part for the ring of HF frequency band antenna.
" execution mode 6 "
Figure 11 is the vertical view of the major part of the antenna assembly 106 of execution mode 6.The radiant element 21 of U-shaped is formed in the ungrounded region NGZ of substrate 10.Be connected with chip capacitor C1 between the first end of radiant element 21 and earthing conductor 11, between the second end 21 of radiant element 21 and earthing conductor 11, be connected with SMT Inductor L1.
Substrate 10 is respectively equipped with the first power supply circuits 31 be made up of UHF band IC and the second power supply circuits 32 be made up of HF frequency band RFID IC.
The input and output portion of the first power supply circuits 31 is connected with the supply terminals of the regulation of radiant element 21 via capacitor C3.Power supply circuits 32 are RFID IC of balance input and output type, and its input and output portion is connected with power supply coil 33 via capacitor.This power supply coil 33 is the ferrite paster antennas being wound with coil on ferrite core.Power supply coil 33 configures in the mode of its coil axes towards radiant element 21 side.Also by power supply circuits 32, capacitor and power supply coil 33 modularization, and this module can be installed on the substrate 10.
In HF frequency band, form LC resonant ring by the end limit of radiant element 21 and earthing conductor 11, inductor L1 and capacitor C1.Power supply coil 33 and this ring magnetic Field Coupling.
Figure 12 is the figure of the mode of the magnetic Field Coupling representing power supply coil 33 and radiant element 21.Power supply coil 33 is configured in the edge of earthing conductor 11, by the magnetic flux of coil 33 of powering with the mode avoiding earthing conductor 11 around, therefore this magnetic flux is easily and radiant element 21 interlinkage formed in the ungrounded region NGZ of substrate 10.
Figure 13 is the equivalent circuit diagram under the HF frequency band of antenna assembly 106.In Figure 13, represent radiant element 21 with inductor L21, represent the end limit of earthing conductor 11 with inductor L11.Power supply coil 33 is connected with the series circuit of capacitor C1A, C1B, forms LC resonant circuit.Second power supply circuits 32 provide the signal of communication of HF frequency band to this LC resonant circuit via capacitor C2A, C2B.
The LC resonant ring be made up of the end limit of radiant element 21 and earthing conductor 11, inductor L1 and capacitor C1 plays the effect of gain antenna 51.
In addition, also as shown in Figure 7, the first end ground connection of radiant element 21 can be made, at the second end configuration inductor and capacitor, also can make the second end ground connection, at first end configuration inductor and capacitor.
In this execution mode, radiant element 21 is not directly connected with the power supply circuits of HF frequency band, and therefore, the degree of freedom of the installation site of power supply coil 33 is higher, can also simplify formation pattern on the substrate 10.
" execution mode 7 "
Figure 14 is the vertical view of the major part of the antenna assembly 107 of execution mode 7.The radiant element 21 of U-shaped is formed in the ungrounded region NGZ of substrate 10.Be connected with SMT Inductor L1 between the first end of radiant element 21 and earthing conductor 11, between the second end of radiant element 21 and earthing conductor 11, be connected with SMT Inductor L2.
Substrate 10 is respectively equipped with the first power supply circuits 31 be made up of UHF band IC and the second power supply circuits 32 be made up of HF frequency band RFID IC.
The input and output portion of the first power supply circuits 31 is connected with the supply terminals of the regulation of radiant element 21 via capacitor C3.The input and output portion of power supply circuits 32 is connected with power supply coil 33 via capacitor.This power supply coil 33 is the ferrite paster antennas being wound with coil on ferrite core, and configures in the mode of its coil axes towards radiant element 21 side.
Figure 15 is the equivalent circuit diagram of the antenna assembly 107 under two frequency bands.In Figure 15, equivalent electric circuit EC1 is the equivalent circuit diagram under UHF band, and equivalent electric circuit EC2 is the equivalent circuit diagram under HF frequency band.In UHF band, inductor L1, L2 are high impedance, and therefore the two ends of radiant element 21 are equivalent to open circuit, play the effect of the electric field radiation antenna of UHF band.
When radiant element 21 is not directly connected with the power supply circuits of HF frequency band, also as this example, the two ends of radiant element 21 can be made via inductor grounding connection to earthing conductor 11.So, in HF frequency band, form ring portion by the end limit of radiant element 21 and earthing conductor 11 and inductor L1, L2.Power supply coil 33 and this ring portion magnetic Field Coupling.So above-mentioned ring portion plays the effect of gain antenna.
" execution mode 8 "
Figure 16 be the communication terminal 201 of the antenna assembly possessing execution mode 8, vertical view under the state unloading lower case.This communication terminal 201 is execution modes of " electronic equipment " of the present invention.Most of housing of communication terminal 201 is made up of metallized package body portion 90, the non-metallic regions 91,92 at both ends is configured with respectively the radiant element 21,20 be made up of profiled metal sheet.Battery pack 52 is accommodated with in metallized package body portion 90.Substrate 10 is provided with power supply circuits 30, first power supply circuits 31, second power supply circuits 32, chip capacitor C1, C2, C3, SMT Inductor L1, photographing module 53 etc.Metallized package body portion 90 is electrically connected with the grounded part of substrate 10.The annexation of above-mentioned each element and radiant element 21 is same as shown in Figure 1.
In UHF band, radiant element 21 and earthing conductor 11 play the effect of the inverted F shaped antenna contributing to electric field radiation.In HF frequency band, the ring portion be made up of the end limit in radiant element 21 and metallized package body portion 90 plays the effect of the loop aerial contributing to magnetic field radiation.
In addition, in the example shown in Figure 16, radiant element 20 is used as cellular communication main antenna, and radiant element 21 is used as (in UHF band) cellular communication sub antenna.
" execution mode 9 "
Figure 17 be the communication terminal 202 of the antenna assembly possessing execution mode 9, vertical view under the state unloading lower case.This communication terminal 202 is execution modes of " electronic equipment " of the present invention.Most of housing of communication terminal 202 is made up of metallized package body portion 90, the non-metallic regions 91,92 at both ends is configured with respectively the radiant element 21,20 be made up of profiled metal sheet.Battery pack 52 is accommodated with in metallized package body portion 90.The substrate 10 of this communication terminal 202 is provided with power supply circuits 30, first power supply circuits 31, chip capacitor C3, RF module 41, photographing module 53 etc.Metallized package body portion 90 is electrically connected with the grounded part of substrate 10.The annexation of above-mentioned each element and radiant element 21 is same as shown in Figure 7.
In UHF band, radiant element 21 and earthing conductor 11 play the effect of the inverted F shaped antenna contributing to electric field radiation.In HF frequency band, the ring portion be made up of the end limit in radiant element 21 and metallized package body portion 90 plays the effect of the loop aerial contributing to magnetic field radiation.
" execution mode 10 "
Execution mode 10 is the examples ring comprising two radiant elements being used as the loop antenna of HF frequency band.
Figure 18 be the communication terminal 203 of execution mode 10, vertical view under the state unloading lower case.Most of housing of this communication terminal 203 is made up of metallized package body portion 90, the non-metallic regions 91,92 at both ends is configured with respectively the radiant element 21,20 be made up of profiled metal sheet.Power supply circuits 30, first power supply circuits 31, second power supply circuits 32, chip capacitor C1, C2, C3 and SMT Inductor L1 etc. are installed in housing.The diagram of substrate is eliminated in Figure 18.
Capacitor C1 is connected with between the first end of radiant element 21 and metallized package body portion 90.Second end of radiant element 21 is connected via inductor, circuit with the first end of radiant element 20.Second end of radiant element 20 is connected by inductor L1 with between metallized package body portion 90.Thus, radiant element 20,21, metallized package body portion 90, above-mentioned inductor and railway superstructures ring, constitute LC resonant circuit by this ring and capacitor C1.Second power supply circuits 32 are powered to above-mentioned LC resonant circuit via capacitor C2.First power supply circuits 31 are powered to the supply terminals of radiant element 21 via capacitor C3.Equally, power supply circuits 30 are powered via the supply terminals of capacitor to radiant element 20.
The HF frequency band loop antenna that ring radius (ring is long) is larger can be formed thus.
" execution mode 11 "
The first reactor element be connected between radiant element and earthing conductor is can not the element of self-resonance in the ideal case, or it is very high to be preferably self-resonant frequency.But actual reactor element, due to containing parasitic component, therefore can produce self-resonance.Present embodiment illustrates following example: when the self-resonant frequency of the first reactor element is positioned at service band, combines the reactor element carrying out self-resonance with allocated frequency band, thus eliminates the problem of self-resonance.
Figure 19 is the vertical view of the major part of the antenna assembly 111 of execution mode 11.This antenna assembly 111 is formed on the substrate 10.Substrate 10 comprise the forming region of earthing conductor 11 and do not form the ungrounded region NGZ of earthing conductor 11.The radiant element 21 of U-shaped is formed in ungrounded region NGZ.That is, the part that this radiant element 21 is parallel by the end limit with earthing conductor 11 and forming from the part that this parallel portion extends to earthing conductor direction.Install between the first end of radiant element 21 and earthing conductor 11 and be electrically connected with chip capacitor (capacitor) C1.Install between second end of radiant element 21 and earthing conductor 11 and be electrically connected with SMT Inductor L1a, L1b, L1c.SMT Inductor L1a, L1b, L1c are equivalent to the first reactor element of the present invention, capacitor C1 is equivalent to the second reactor element of the present invention.
Different from the antenna assembly 101 in execution mode 1 shown in Fig. 1, utilize the series circuit of multiple reactor element to form the first reactor element.In this example, utilize three SMT Inductor L1a, the series circuit of L1b, L1c forms the first reactor element.Antenna assembly 101 shown in other structures with execution mode 1 is identical.
Figure 20 is the figure of the frequency characteristic of the insertion loss (S21) representing the first reactor element observed from the first power supply circuits 31.The trough of the insertion loss of the 800MHz frequency band shown in Figure 20,2GHz frequency band, 5GHz frequency band produces because of above-mentioned three inductors L1a, L1b, L1c.That is, SMT Inductor L1a, L1b, L1c can be considered as the circuit that respective parasitic component and electric capacity and inductor are connected in parallel.In this example, SMT Inductor L1a, L1b, L1c self-resonant frequency is separately 800MHz, 2GHz, 5GHz.Therefore, SMT Inductor L1a, L1b, L1c are high impedance (being equivalent to open-circuit condition) under respective self-resonant frequency.Therefore, under respective frequency band, second end (being provided with the side of the first reactor element, i.e. SMT Inductor L1a, L1b, L1c) of radiant element 21 is equivalent to open circuit.Its result, as shown in figure 20, in UHF band (the first frequency band), under each frequency band, the first reactor element can not hinder radiant element to play the effect of antenna, and thus radiant element 21 plays the effect of antenna under broadband.
By arranging the series circuit of the different multiple SMT Inductor of respective self-resonant frequency as described above as the first reactor element, thus to expand in UHF band (the first frequency band), to play the frequency band of antenna effect.
In addition, in the example shown in Figure 19, be provided with three SMT Inductor, as long as but the reactor element of at least self-resonance under assigned frequency, its parts number can be two, also can be more than four.In addition, paster reactor is not limited to, as long as the reactor element of self-resonance under assigned frequency can be suitable for as reactor element.
In addition, in above-described each execution mode, show the antenna assembly of dual-purpose in UHF band antenna and HF frequency band antenna, but the present invention is not limited to this frequency band certainly.Such as also can be applied to the frequency band beyond W-LAN, FM broadcast of 5GHz frequency band, the antenna for receiving of AM broadcast etc., UHF, HF frequency band.
In addition, the ring portion be particularly made up of radiant element, reactor element and earthing conductor, is not limited to the use that communicates, also can be applied to the antenna of the power delivery of magnetic resonance type wireless charger.
Label declaration
C1 capacitor (the second reactor element)
C3 capacitor (the 3rd reactor element)
FP power supply pin
L1, L1a, L1b, L1c inductor (the first reactor element)
LPF low pass filter
The ungrounded region of NGZ
OP open end
SP earth terminal
10 substrates
11 earthing conductors
12 electrodes
20,21 radiant elements
30 power supply circuits
31 first power supply circuits
32 second power supply circuits
33 power supply coils
41 RF modules
51 gain antennas
53 photographing modules
90 metallized package body portions
91,92 non-metallic regions
101 ~ 107,111 antenna assemblies
201 ~ 203 communication terminals

Claims (12)

1. an antenna assembly, the radiant element that this antenna assembly comprises electric field type antenna and the earthing conductor be oppositely disposed with described radiant element, is characterized in that,
Be connected with at least one first reactor element between described radiant element and described earthing conductor, be made up of the ring portion of field type antenna described radiant element, described first reactor element and described earthing conductor.
2. antenna assembly as claimed in claim 1, it is characterized in that, described radiant element is the antenna element of the first frequency band, and described ring portion is the antenna element of second frequency band lower than described first frequency band.
3. antenna assembly as claimed in claim 2, it is characterized in that, described first reactor element be impedance under the second frequency band than the first frequency band closer to short-circuit condition, under the first frequency band than the second frequency band closer to the element of open-circuit condition, and be arranged under the state close to described short-circuit condition, form the position of described ring portion together with described radiant element and described earthing conductor.
4. as claimed in claim 2 or claim 3 antenna assembly, is characterized in that, described first reactor element be under described first frequency band for capacitive, be the inductor of perception under described second frequency band.
5. the antenna assembly as described in any one of claim 2 to 4, is characterized in that, comprises the second reactor element be connected in series with described first reactor element, described radiant element and described earthing conductor,
Described second reactor element be impedance under the second frequency band than the first frequency band closer to open-circuit condition, under the first frequency band than the second frequency band closer to the element of short-circuit condition.
6. antenna assembly as claimed in claim 5, is characterized in that, described second reactor element be under described first frequency band for perception, be the capacitor of capacitive under described second frequency band.
7. the antenna assembly as described in claim 5 or 6, it is characterized in that, be configured with the power supply circuits of the signal of communication that described second frequency band is provided at the two ends of described first reactor element, described second reactor element and described second reactor element in the mode of a high-frequency model.
8. the antenna assembly as described in any one of claim 2 to 7, it is characterized in that, comprise the 3rd reactor element, 3rd reactor element is connected with providing the supply terminals of the signal of communication of described first frequency band to described radiant element, and higher with described first frequency band phase specific impedance under described second frequency band.
9. the antenna assembly as described in any one of claim 2 to 8, is characterized in that, comprises power supply coil, and this power supply coil is connected with the power supply circuits of the signal of communication of described second frequency band, and with described ring portion magnetic Field Coupling.
10. the antenna assembly as described in any one of claim 1 to 9, is characterized in that, described radiant element is the antenna of cellular communication, and described ring portion is the antenna of HF frequency band rfid system.
11. antenna assemblies as described in any one of claim 1 to 10, it is characterized in that, described first reactor element is connected in series by multiple reactor element and forms.
12. 1 kinds of electronic equipments, comprise antenna assembly, provide the first power supply circuits of the signal of communication of the first frequency band to this antenna assembly and provide the signal of communication of the second frequency band or the second power supply circuits of power to described antenna assembly, it is characterized in that,
Described antenna assembly comprises the radiant element of electric field type antenna, the earthing conductor be oppositely disposed with described radiant element and at least one reactor element,
Described reactor element is connected between described radiant element and described earthing conductor, and forms the ring portion of field type antenna by described radiant element, described reactor element and described earthing conductor.
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